Holder for sharpening gravers and other tools.



E. A. GRAVES. I

HOLDER FOR SHARPENING GRAVERS AND OTHER TOOLS.

APPLICAFION FILED APR.2B,191e,

l 1 92,4 1 6 Patentefi July 25, 1916.

Hnw@1mtmm EDGAR A. GRAVES, OF ROCHESTER, NEW YORK.

HOLDER FOR SHARPENING GRAVERS AND OTHER TOOLS.

LIQZATG.

Specification of Letters Patent.

Patented July 25, 1916.

Application filed April 28, 1916. Serial No. 94,278. v

To all whom it may concern Be it known that I, EDGAR A. GRAVES, a citizen of the United States, and resident of ltochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Holders for Sharpening Gravers and other Tools, of which the following is a specification.

This invention relates to holders for shapening gravers and others tools, and particularly the type designed to permit the gravel to be moved to and fro over the surface of the sharpening material.

With holders of this type diihculty is experienced in moving the tool over the sharpening surface under pressure sufiicient to produce the desired edge without turning the tool within the holder or tilting the holder upon its supporting surface, so that the edge of the tool is moved out of the angle at which it should be ground in order that the bevel may be preserved at which the tool was originally faced. This difficulty has been avoided in applicants holder by a simple tripod construction, with the tool in place, and a long bearing for the tool that is centrally located.

In the drawings:Figure 1 is a perspective view of the holder With a tool in place; Fig. 2 is a transverse section on the line 2-2 of Fig. l; and Fig. 3 is a central, longitu din al section.

The holder comprises a pair of spreading legs 1, 1 with hubs 2, 2 between which the hub 3 rotates and may be clamped in set position by the friction nut 4,. Extending atright angles to the axis of the hubs 2, 2

and 3 is a sleeve 5 that is an integral part of the hub 3, within this sleeve 5 is a rotary sleeve 6 and Within the latter there is a square tube 7. The tube 7 is designed to receive the tool that is to be sharpened, which usually is square in cross-section. A set-screw 8 clamps the tool in place, and another set-screw locks the rotary sleeve 6 in position.

In operation the tool 1s inserted through the square tube 7 and clamped in place by the screw 8. The legs 1, l of the holder are placed upon a sheet of glass or other smooth surface, the edge of the tool is adjusted on oilstone, or other sharpening surface, to the bevel of the tool, and the setscrews 4 and 9 are tightened. This construction of the holder brings the point at which pressure is applied in moving the tool during the sharpening operation, at the center of the tripod formed by the two legs 1, l and the end of the tool, and also brings this point of pressure low down as compared with the distance separating the legs of the tripod, so it is possible to bear down forcibly on the holder as it is moved over the surfaces without tilting it or upsetting it.

The tube within the rotary sleeve gives a long bearing for the tool that is a distinct advantage in that it holds the tool against turning in the holder under the pressure applied in sharpening it, and the simple compact construction afforded by the combination of sleeves and standard described makes possible the adjustment of the holder to short as Well as long tools, and to edges beveled at all angles.

What I claim as my invention and desire to secure by Letters Patent is A tool holder comprising a sleeve, a second sleeve rotatively adjustable in the first named sleeve and projecting from one end of the latter, a set screw mounted in the projecting portion to secure a tool in said second named sleeve, means for binding the second named sleeve against the inner Wall of the first named sleeve to prevent the turning of the second named sleeve, a hub on the under side of the first named sleeve, a pair of legs having spaced hubs receiving the hub on the sleeve between them, a pin extending through all of said hubs and serving as a pivot about which the legs swing on the sleeve, and a nut connected to said pin to produce friction between the hubs.

EDGAR A. GRAVES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 2!). 0. 

